Kartering av karst på Gotland med LiDAR - en metodstudie

• Main Author: Stocklassa Palmlöv, Christine
• Format: Others
• Language: Swedish
• Published: Stockholms universitet, Institutionen för naturgeografi 2015
• Subjects: LiDAR; ArcGIS; karst; dolines; methods; mapping; identification; Gotland
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-119868

LiDAR (Light Detection and Ranging) is an active remote sensing system which is used to map the surface of the Earth and which can be processed to show the ground surface under the canopy cover. The aim of this study is to examine if LiDAR can be used as a method for mapping karst on the island of Gotland, what kind of karst morphologies may be identified and their geographical distribution. LiDAR was visualized in the computer platform ArcGIS and in ArcMap version 10.3 (Esri). More than 2000 karst objects were mapped using LiDAR. Of these, eight different locations including 34 potential karst objects were chosen for field control. Six different classes of karst have been identified including three classes of dolines. The results show that LiDAR can be used for mapping karst, especially the bigger karst morphologies which are easier to identify. The results from the field control show that 45 % of the small dolines, 43 % of the medium sized dolines and 33 % of the large dolines which has been mapped in LiDAR were actual dolines. For larger scale karst morphologies the success rate was almost 100 %. The method did not lend itself well to identification of sinkholes, most likely related to the very small size of these on Gotland.